Ah. Yes didn't realize that. Maybe not so easy after all haha.Not entirely true the sushi vinegar can contain wheat sometimes. So you gotta be careful. Wheat is in much more food than you actually think. I once got served mugi gohan even tho me and my Japanese friend communicated with the staff that mugi is no-no.
Sushi and some drops of soy sauce have never given me a reaction - I guess I'm probably not as sensitive as some other people .